The South Orange Open, formerly known as the Eastern Grass Court Championships, is a defunct Grand Prix affiliated tennis tournament founded in 1970 as the Marlborough Open Championships and in existence until 1983. It was held in South Orange, New Jersey in the United States and played on outdoor grass courts from 1970 to 1974, and then played on outdoor clay courts from 1975 to 1983. There were men's and women's singles tournaments as well as men's, women's, and mixed doubles. Ilie Năstase was the most successful player at the tournament, winning the singles competition three times on two different surfaces and the doubles competition twice with American Jimmy Connors.

Results

Men's singles

Men's doubles

Women's singles

(incomplete roll)

Women's doubles

(incomplete roll)